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So far, including the traditional statistical model or the numerical model currently applied, the temperature correction function is often established based on the concept of three-point temperature of crop photosynthesis. A temperature definitely corresponds to a fixed correction coefficient. For a long time, people have not yet conducted a deeper discussion on the most basic concept of the temperature effect function. In fact, since a certain daily average temperature value does not necessarily correspond to a fixed temperature diurnal variation process, it does not necessarily correspond to a certain temperature correction coefficient. This article will be more in-depth discussion of this, in order to discuss the effects of temperature on photosynthetic basis on the basis of experiments and theory, and on this basis proposed the establishment of temperature influencing function of the theoretical method, derived in the Huang-Huai-Hai area temperature correction function of summer corn .
The established temperature-influencing function is different from the simple assumptions in the past and has a strict derivation process and a large amount of measured data. However, it should be noted that the model is, after all, a simplification of the real system, which inevitably has certain limitations. The models that are inclusive and need no further improvement and discussion do not exist at all. The temperature correction function of summer maize in the Huang-Huai-Hai area is given in this paper. The photosynthetic characteristics of summer maize leaves in other growing stages are quite different from those in this period, and therefore cannot be combined. For the first time, the definition and calculation method of photosynthetic equivalent temperature were given by the photosynthesis instrument. Based on this, the temperature influence functions of other growth stages of summer maize and other crops were determined, and the intrinsic relationship between the equivalent photosynthetic temperature and average temperature was clearly revealed. These have yet to undergo in-depth research.
The photosynthetic apparatus was used to determine the photosynthetic rate of summer maize, and the photosynthetic model of the leaves was given. The numerical model of summer-canopy light-temperature productivity was established, and the relative deterministic relationship between the daily average temperature and canopy photosynthesis was elucidated. The concept and calculation method of photosynthetic equivalent temperature were proposed. On this basis, the functional expression of the temperature effect on the photosynthesis of the population was deduced, and the temperature correction function f(T) is no longer a simple assumption, but is based on a more rigorous theoretical basis, thus realizing the photosynthetic model. The time scale conversion provides a prerequisite for more accurate establishment of ecological dynamic models and numerical models of agricultural climate resources.